<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //整形: integer 浮点数；float
        let score = '98.2';
    // 1.字符串转化为number
    score = parseFloat(score);
    // score = parseint(score);
    console.log(score);
    console.log(typeof score);
    // 2.not a number
    score =  parseInt('剑豪');
    console.log(score);
    
    // 3.强制转化为number
    let  age = Number('345');
    console.log(typeof age);
    </script>
</body>
</html>